Anti-PD-1/PD-L1 Antibody Therapy for Pretreated Advanced or Metastatic Nonsmall Cell Lung Carcinomas and the Correlation between PD-L1 Expression and Treatment Effectiveness: An Update Meta-Analysis of Randomized Clinical Trials

Table 1

Jadad quality score of included studies.

Study	Randomization	Blinding	Reported withdrawals and dropouts	Overall score
Borghaei	2	0	1	3
Brahmer	2	0	1	3
Herbst	2	0	1	3
Fehrenbacher	2	0	1	3
Rittmeyer	2	0	1	3